By Ariel Marcy, 18 December 2024
Double Helix Extra readers really got busy with brainteasers in 2024! Let’s do a count down of your top 5…
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By David Shaw, 9 December 2021
Most people are a lot larger than a piece of paper. But in this activity, you’ll be able to squeeze through a hole in a sheet of paper. With practice, you might even be able to fit through a hole in a business card!
By David Shaw, 2 October 2019
Difficulty: Tricky Imogen has had enough of her goats getting into her veggie patch. She’s bought wire and poles, but before she starts building, she must work out what shape fence she needs.
